<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
  <link rel="stylesheet" href="http://at.alicdn.com/t/c/font_4144272_3vtq4renm6e.css">
  <style>
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: 'Poppins', sans-serif;
}
body {
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 100vh;
  background: #222327;
}
.nav {
  width: 400px;
  height: 70px;
  padding: 0 25px;
  border-radius: 10px;
  background-color: #fff;
  position: relative;
  display: flex;
}
.nav li {
  width: 70px;
  height: 70px;
  z-index: 1;
  position: relative;
  list-style: none;
  cursor: pointer;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
}

.nav li i {
  position: relative;
  display: block;
  height: 70px;
  line-height: 70px;
  font-size: 24px;
  text-align: center;
  transition: all 0.5s;
}
.nav li span {
  position: absolute;
  font-size: 12px;
  letter-spacing: 2px;
  transition: all .5s;
  opacity: 0;
  transform: translateY(20px);
}

.nav li.active i {
  transform: translateY(-35px);
  color: #fff;
}
.nav li.active span {
  opacity: 1;
  transform: translateY(10px);
}

    .indicator {
      position: absolute;
      top: -50%;
      width: 70px;
      height: 70px;
      background: #2196f3;
      border-radius: 50%;
      border: 6px solid #222327;
      transition: all .5s;
    }
    .indicator::before {
      content: '';
      position: absolute;
      top: 50%;
      left: -22px;
      width: 20px;
      height: 20px;
      background-color: #fff;
      border-top-right-radius: 20px;
      box-shadow: 1px -10px 0 0 #222327;
    }
    .indicator::after {
      content: '';
      position: absolute;
      top: 50%;
      right: -22px;
      width: 20px;
      height: 20px;
      background-color: #fff;
      border-top-left-radius: 20px;
      box-shadow: -1px -10px 0 0 #222327;
    }

li:nth-child(1).active~.indicator {
  transform: translateX(calc(70px * 0));
}
li:nth-child(2).active~.indicator {
  transform: translateX(calc(70px * 1));
}
li:nth-child(3).active~.indicator {
  transform: translateX(calc(70px * 2));
}
li:nth-child(4).active~.indicator {
  transform: translateX(calc(70px * 3));
}
li:nth-child(5).active~.indicator {
  transform: translateX(calc(70px * 4));
}
  </style>
</head>

<body>
  <!-- 导航 -->
  <ul class="nav">
    <li class="active">
      <i class="iconfont icon-home"></i>
      <span>Home</span>
    </li>
    <li>
      <i class="iconfont icon-envelope"></i>
      <span>Email</span>
    </li>
    <li>
      <i class="iconfont icon-comment"></i>
      <span>Message</span>
    </li>
    <li>
      <i class="iconfont icon-heart"></i>
      <span>Like</span>
    </li>
    <li>
      <i class="iconfont icon-user"></i>
      <span>Profile</span>
    </li>

    <div class="indicator"></div>
  </ul>

</body>
<script>
  const lis = document.querySelectorAll('.nav li');
  lis.forEach(li => {
    li.addEventListener('click', function () {
      lis.forEach(item => {
        item.classList.remove('active');
        this.classList.add('active')
      })
    })
  })
</script>

</html>